9 days
Liquid chromatography/tandem mass spectrometry (LC/MS-MS)
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Quantifies phenylalanine. Used in diagnosis and monitoring of phenylketonuria (PKU).
Plasma
0.5 mL
Green-top (heparin) tube or lavender-top (EDTA) tube
No special preparation is required for this test. You may eat, drink, and take your medications as normal, unless instructed otherwise by your healthcare provider.
This test does not require any special collection or pre-analytical handling. Follow routine specimen collection protocols.
| Temperature | Period |
|---|---|
| Frozen | 14 days |